At the macroscopic level when a firework goes off the effects of molecules interacting can be observed through the light being produced. I expect the firework to travel to a high distance vertically in the air. I expect the firework to start in a tight ball. As it travels the tight ball (of molecules) will expand in its perimeter causing the firework to combust, making a very loud bang. I’m sure that heat radiates as a outcome of this interaction, though it wouldn’t be smart to get close enough to feel the heat. Also, I expect the combusting to give of a burning smell, similar to an explosive. At the molecular-level when a firework goes off molecules will begin to exchange electrons due to increasing levels of temperature (must be ignited